Hibernate关系映射--单向一对一@OneToOne_java中hibernate-mapping一对一单向-优快云博客

本文链接：https://blog.youkuaiyun.com/muyeju/article/details/47905317

本文介绍了Hibernate中单向一对一的关系映射，包括无连接表和有连接表的情况。在无连接表的一方使用@OneToOne和@JoinColumn(unique=true)，在有连接表的情况下，通过@JoinTable定义关联表格并指定外键。

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1.无连接表的单向一对一

单向一对一与单向多对一很相似
需要在一的一方添加注解@OneToOne @JoinColumn（name=""，unique=true) 因为是一对一，所有要unique=true
主要代码及例子

在一的一方添加注解@OneToOne(cascade={CascadeType.ALL}) @JoinColumn(name="",unique=true)

<span style="font-family:Microsoft YaHei;">//表一学生表（假如：一个学生只能有一个地址）
@Entity
@Table(name = "T_JC_test1")
@Where(clause="recordStatus='"+GlobalConstant.FLAG_Y+"'")
public class Test1 extends BusinessEntity{
	private static final long serialVersionUID = 2535128385272676564L;
	private String name;
	private Test2 address;

	@OneToOne(cascade={CascadeType.ALL})
	@JoinColumn(name="test1ID",unique=true)
	public Test2 getAddress() {
		return address;
	}
	public void setAddress(Test2 address) {
		this.address = address;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}
//表二，地址表
@Entity
@Table(name = "T_JC_test2")
@Where(clause="recordStatus='"+GlobalConstant.FLAG_Y+"'")
public class Test2 extends BusinessEntity{
	private static final long serialVersionUID = -7653945367481001205L;
	private String addressDetatil;
	public String getAddressDetatil() {
		return addressDetatil;
	}
	public void setAddressDetatil(String addressDetatil) {
		this.addressDetatil = addressDetatil;
	}	
}
</span>

2.有链接表的单向一对一

有链接表的单向一对一只需在一的一方添加注解@OneToOne(cascade={CascadeType.ALL}) @JoinTable(name="T_JC_test1_test2",joinColumns=@JoinColumn(name="test1ID",unique=true),inverseJoinColumns=@JoinColumn(name="test2ID",unique=true))
例子如下

<span style="font-family:Microsoft YaHei;">//表一，学生表
@Entity
@Table(name = "T_JC_test1")
@Where(clause="recordStatus='"+GlobalConstant.FLAG_Y+"'")
public class Test1 extends BusinessEntity{
	private static final long serialVersionUID = 2535128385272676564L;
	private String name;
	private Test2 address;<span style="white-space:pre">	</span>//引用表二

	@OneToOne(cascade={CascadeType.ALL})
	@JoinTable(name="T_JC_test1_test2",joinColumns=@JoinColumn(name="test1ID",unique=true),inverseJoinColumns=@JoinColumn(name="test2ID",unique=true))
	public Test2 getAddress() {
		return address;
	}
	public void setAddress(Test2 address) {
		this.address = address;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

//表二，地址表
@Entity
@Table(name = "T_JC_test2")
@Where(clause="recordStatus='"+GlobalConstant.FLAG_Y+"'")
public class Test2 extends BusinessEntity{
	private static final long serialVersionUID = -7653945367481001205L;
	private String addressDetatil;
	public String getAddressDetatil() {
		return addressDetatil;
	}
	public void setAddressDetatil(String addressDetatil) {
		this.addressDetatil = addressDetatil;
	}	
}</span>